Danfoss Airflex AA2 Single Passage Rotorseals Instruction Manual
- June 13, 2024
- Danfoss
Table of Contents
Danfoss Airflex AA2 Single Passage Rotorseals Instruction Manual
⚠ Warning
Forward this manual to the person responsible for Installation, Operation and
Maintenance of the product described herein. Without access to this
information, faulty Installation, Operation or Maintenance may result in
personal injury or equipment damage.
⚠ Caution:
Use Only Genuine Airflex Replacement Parts
The Airflex Division of Danfoss recommends the use of genuine Airflex
replacement parts. The use of non-genuine Airflex replacement parts could
result in substandard product performance, and may void your warranty. For
optimum performance, contact Airflex.
1.0 INTRODUCTION
Throughout this manual there are a number of HAZARD WARNINGS that must be read and adhered to in order to prevent possible personal injury and/or damage to the equipment. Three signal words “DANGER” , ” WARNING” , and ” CAUTION” are used to indicate the severity of the hazard, and are preceded by the safety alert symbol
⚠ DANGER
Denotes the most serious injury hazard, and is used when serious injury or
death WILL result from misuse or failure to follow specific instructions.
⚠ WARNING
Used when serious injury or death MAY result from misuse or failure to
follow specific instructions.
⚠ CAUTION
Used when injury or product/equipment damage may result from misuse or failure
to follow specific instructions.
It is the responsibility and the duty of all personnel involved in the installation, operation and maintenance of the equipment on which this device is used to fully understand the, and procedures by which hazards are to be avoided.
1.1 Description
1.1.1 The Airflex single passage rotorseal is a positive seal rotary union (rotary joint). The rotorseal permits the transfer of gases or liquids, under pressure, into or out of the exposed end of a rotating shaft. The rotorseal operates continuously or intermittently up to rated speeds in either direction.
⚠ CAUTION
The factory must be consulted when contemplating the use of Airflex rotorseals
with mediums other than air.
1.1.2 Ball bearings are used between the stationary and rotating parts. The
rotorseals are lubricated for life at the factory to give long, maintenance-
free service.
1.1.3 The rotorseal housing (1) features an inlet port with the American
National pipe thread size show n on Table 2.
- B3 rotorseal is furnished with an adapter, having 1/4 NPT internal threads and is a direct replacement for the discontinued B2 rotorseal.
1.2 How It Works
1.2.1 The sealing between the stationary housing (1) of the rotorseal and the carbon seal ring (7), occurs at the lapped seal face of the rotating shaft (3). A light coil spring (4) keeps the carbon seal ring in place assuring a positive seal between the components. See Figure 1.
2.0 INSTALLATION
2.1 Preparation
2.1.1 The Airflex rotorseals have threaded shafts for direct and easy mounting
to the shaft or assembly. Inspect the internal thread form in the mounting
shaft to insure that there is no damage to the threads. Insure that the proper
diameter and depth conform with Table 3 specifications.
2.1.2 A good pipe thread sealant should be applied to the outside thread on
the rotorseal shaft before mounting.
2.2 Air connection
2.2.1 The rotorseal housing has an American National Pipe Thread air inlet as show n in Table 2. This connection to the rotorseal should always be through a flexible hose. Refer to Figure 2 for examples of mounting assemblies.
The use of a rigid air connection will tend to preload the rotorseal bearing.
This will result in poor bearing life, and/or bearing failure.
2.2.2 Connect the flexible hose to the rotorseal inlet. A good pipe thread
sealant should be used at this joint.
This first installation step is necessary to avoid damage to the rotorseal
bearing and seals.
2.2.3 Install the copper gasket (2) over the threaded portion of the rotorseal
shaft. This gasket must be seated against the inside face of the shaft . Apply
a good pipe thread sealant to the thread on the rotorseal shaft. Thread this
assembly into the shaft mounting. Refer to Table 3.
2.2.4 A union type connection to the supply line completes the installation. See Figure 3. All supply piping must be self supporting.
3.0 OPERATION
3.1 Temperature
3.1.1 The rotorseal operating temperature is dependent upon the sealing ” O”
ring rubber compounds and/or the type of ball bearings used in their design.
3.1.1.1 The AA2, B3, and C2 rotorseals have a maximum operating temperature of
220oF (104oC).
3.2 Pressure and Speed Limits
3.2.1 Airflex rotorseals are designed with low internal friction for cool
operation, even at rated speeds. Specific models of this product are offered
for standard and high pressure operating applications. See Table 4.
3.2.2 Maximum rotorseal pressure and speed limits are show n on Table 4.
The operation of Airflex rotorseals at maximum air pressure combined with maximum speed should be avoided. Consult the factory for details of specific application data.
4.0 MAINTENANCE
Prior to performing any maintenance on the rotorseal, make sure the equipment is in, and will remain in, a safe condition.
4.1 Wear Limits
4.1.1 The Airflex rotorseals are lubricated for life and require no maintenance. If a rotorseal has become ineffective after prolonged service, it can be restored to good operating condition by rebuilding it.
4.2 Rebuilding
4.2.1 A replacement kit is available to allow the rebuilding of these rotorseals in the field. Airflex rotorseals are manufactured of quality materials which are held to precision tolerances. NOTE: Only genuine Airflex rotorseal parts should be used. The rotorseal should be removed from its mounting and repairs should be made in a clean, dust-free environment.
4.2.2 Disassembly
4.2.3 Remove the snap ring (11). This can be done with the aid of snap ring pliers. Insert the pins of the pliers into the holes in the snap ring. Compress the ring enough to insure that the groove in the housing (1) w ill not be damaged, and remove the snap ring.
4.2.4 Refer to Figure 1 for bearing arrangement. Remove shaft (3) and bearing (9) and/or (9A) from the housing (1) by holding the hex portion of the shaft in a vies while striking the housing gently with a light mallet. Rotate the housing while striking to reduce the tendency of binding the bearing in the housing.
4.2.5 Remove the spring (4), spring stop (5), ” O” ring (6), and seal (7) from the housing (1) w ith the aid of a small w ire hook.
4.3 CLEANING AND INSPECTION
4.3.1 Clean all the parts thoroughly after disassembly w ith a grease cutting solvent.
The manufacturer of any grease cutting solvent publishes a Material Safety Data Sheet. This sheet must be read and understood before using the product.
4.3.2 Inspect the lapped sealing end of the shaft (3). This sealing surface should be free of scoring and excessive w ear.
4.3.2.1 Inspect the bearings (9)(9A) for roughness, end play and contamination. They should be in good condition, free of rust, and should revolve smoothly w ithout any tendency to bind.
4.3.3 If the shaft (3) or the bearings (9)(9A) are in poor condition, they must be replaced. If these tw o parts require disassembly, remove the shaft external snap ring (8) and press the bearings from the shaft.
4.3.4 Inspect the housing (1) for damage from the outer race of the bearings (9)(9A) rotating. Replace the housing if necessary.
Only genuine Airflex rotorseal parts should be used (Bearings or shaft can be obtained from the factory separately).
4.4 ASSEMBLY
4.4.1 Assemble the spring (4), spring stop (5), ” O” ring (6), and seal (7) as show n in Figure 1, making sure the ” O” ring seats properly on the chamfered surface of the seal.
4.4.1.1 Re-pack grease cavity in the housing (1) of rotorseals with Alvania #2 Oil grease or equivalent. All unsealed bearings must be packed (refer to parts list).
Failure to follow this lubrication procedure may result in rotorseal damage or failure.
4.4.1.2 Note the proper orientation of the seal or shield if applicable and assemble bearings (9) and/or (9A) onto the shaft (3). Refer to Figure 1. On the older styles of B3 and C2 rotorseals, the collar (10) must be on the shaft before the bearing is pressed on. Replace the shaft external snap ring (8) into the shaft groove to lock the bearing into place.
4.4.1.3 Assemble shaft and bearings into housing (1). Enter the bearings evenly in the housing to prevent binding. Press end of shaft gently until the outer race is against the housing shoulder.
4.4.1.4 Replace the snap ring (11) in the housing groove to retain the assembly. Check the shaft rotation for smooth operation. There must be no bind.
5.0 ORDERING INFORMATION/ TECHNICAL ASSISTANCE
5.1 In any correspondence regarding Airflex Equipment, refer to the Part Number show n on the housing.
6.0 PARTS LIST
PRODUCTS WE OFFER:
- Cartridge valves
- DCV directional control valves
- Electric converters
- Electric machines
- Electric motors
- Gear motors
- Gear pumps
- Hydraulic integrated circuits (HICs)
- Hydrostatic motors
- Hydrostatic pumps
- Orbital motors
- PLUS+1® controllers
- PLUS+1® displays
- PLUS+1® joysticks and pedals
- PLUS+1® operator interfaces
- PLUS+1® sensors
- PLUS+1® software
- PLUS+1® software services, support and training
- Position controls and sensors
- PVG proportional valves
- Steering components and systems
- Telematics
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References
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